Abox of mass 50 kg is pushed hard enough to set it in motion across a flat surface. then a 99-n pushing force is needed to keep the box moving at a constant velocity. what is the coefficient of kinetic friction between the box and the floor?

0.23

0.20

0.18

0.17

0.20

Explanation:

The box is moving at constant velocity, which means that its acceleration is zero; so, the net force acting on the box is zero as well.

There are two forces acting in the horizontal direction:

- The pushing force: F = 99 N, forward

- The frictional force: , backward, with

coefficient of kinetic friction

m = 50 kg mass of the box

g = 9.8 m/s^2 gravitational acceleration

The net force must be zero, so we have

which we can solve to find the coefficient of kinetic friction:

answer: the direction of the wind is expressed as the direction from which the wind is blowing. for example, easterly winds blow from east to west, while westerly winds blow from west to east.

explanation:

explanation:

v=uf/(u-f)

= 5.-10/(5+10) convex lens has negative focal length